In order to contribute towards the hoped-for approaching relief by active co-operation, three separate armies were formed out of the garrison of Paris.
The first, under General Clément Thomas, consisted of 226 battalions of the National Guard, in round numbers 130,000 men. Its duty was the defence of the enceinte and the maintenance of quietude within the city. The second, under General Ducrot, constituted the most trustworthy element, especially the troops of the former XIIIth and XIVth Corps. This army was apportioned into three (Infantry) Corps and one Cavalry Division, and it consisted of fully 100,000 men and more than 300 guns. It was designed for active service in the field, and for making sorties on the investing forces. The third army, under General Vinoy, 70,000 strong, was made up of six Divisions of Gardes-Mobiles and one Cavalry Division; and to it also Maud'huy's Division of the line was assigned. It was to aid the more important sorties by diversions on subordinate fronts. In addition to all these details, 80,000 Gardes-Mobiles were in the forts, and 35,000 more in St. Denis under Admiral de la Roncière.
The available military strength consequently amounted to above 400,000 men.
The garrison exhibited a lively activity in petty nocturnal enterprises. The heavy guns of the defences carried to Choisy le Roi, and even as far as Beauregard, near Versailles. On the peninsula of Gennevilliers trenchwork was energetically set about, and the task of bridge-building was undertaken. Many signs pointed to an intended effort on the part of the French to break out in a westerly direction. But since, as long as the IInd Army was still incomplete, the greatest danger threatened from the south, the supreme Command in Versailles, as already mentioned, ordered the IInd Corps into the position behind the Yvette from Villeneuve to Saclay. On the north of Paris the Guard Corps extended itself leftward as far as Aulnay, the XIIth sent one brigade across to the south bank of the Marne, and the Würtemberg Division moved into the interval between the Marne and the Seine caused by the shifting of the IInd Corps.
On November 18th the summons from Tours reached Paris, calling on the latter with all promptitude to reach the hand to the Army of the Loire; certainly somewhat prematurely, since, as we know, that army was at the time concerning itself only in regard to defensive measures.